Restore Your SUV’s Drivability with a VIN-Programmed TCM
If your 2007-2008 Chevrolet Suburban 1500 is suffering from erratic shifting, getting stuck in gear, or throwing transmission-related codes, the problem often lies with a failing Transmission Control Module (TCM). As the electronic brain of your 4L60E or 4L65E automatic transmission, a faulty TCM can make your reliable family hauler feel unpredictable and unsafe. This replacement T42 TCM, part number 24240449, is the definitive solution to get your Suburban shifting smoothly and reliably again, without an expensive trip to the dealership.
Over my two decades in automotive diagnostics, I’ve seen countless vehicle owners worry they need a complete transmission rebuild when the real culprit is this module. The symptoms can be alarming, but the fix is often surprisingly straightforward. This isn’t just a part; it’s a direct-fit, pre-programmed solution designed to restore your vehicle’s factory performance and your peace of mind. We handle the complex part—programming the module to your specific Vehicle Identification Number (VIN)—so you can enjoy a simple, plug-and-play installation.
From the Diagnostic Bay: The Suburban That Dodged a Rebuild
A customer brought in his ’07 Suburban, convinced the transmission was shot. It was slamming into gear and wouldn’t shift past 2nd. The dash was lit up with a check engine light, and his scan tool showed a generic P0700 code. Another shop had quoted him over $3,000 for a transmission rebuild. I hooked up my professional scanner and dug deeper. The solenoids were testing fine, and the fluid was clean. The real issue? Intermittent communication loss with the TCM. We installed one of our pre-programmed modules, and in less than an hour, the Suburban was shifting like it just rolled off the factory floor. He saved thousands, all because we correctly identified the electronic failure instead of the mechanical one.
Is Your Suburban Showing These Telltale Signs?
A failing TCM doesn’t always mean a catastrophic failure. Often, the signs are subtle at first and worsen over time. If you’re experiencing any of the following, your 2007-2008 Suburban 1500 Transmission Control Module is likely the cause:
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750-P0758 (solenoid circuits), or U-codes for communication loss.
- ✔ Inability to upshift or downshift properly.
- ✔ A sudden, unexplained drop in fuel economy.
- ✔ The transmission seems to slip out of gear.
A Straightforward Guide to Installation
One of the best features of this module is its ease of installation. You don’t need to be a master mechanic to get this job done in your own driveway. For the 2007-2008 Suburban 1500, the TCM is conveniently located in the engine bay.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On your Suburban, the TCM is typically found next to the battery in the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the old module from its mounting bracket.
- Install the New TCM: Mount your new, pre-programmed module in the same location. Secure the bolts and firmly reconnect the wiring harnesses until they click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. While our programming resolves most codes, it’s good practice to use a basic OBD2 scanner to clear any stored DTCs.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct replacement for part number 24240449 and is compatible with a wide range of General Motors vehicles. While this page focuses on the 2007-2008 Suburban 1500 Transmission Control Module, it also fits the following models. Always confirm your specific model and year.
- Chevrolet: Suburban 1500 (07-08), Tahoe (07-09), Avalanche 1500 (07-08), Silverado 1500/2500 (07-13), Express Van, Cobalt, HHR, Impala, Monte Carlo
- GMC: Yukon / Yukon XL 1500 (07-09), Sierra 1500/2500 (07-13), Savana Van, Envoy, Canyon
- Cadillac: DTS (06-11)
- Buick: LaCrosse (06-09), Lucerne (06-11), Rainier (06-07)
- Pontiac: G6 (06-10), Grand Prix (06-08)
- And more… including select Saturn, Hummer, and Saab models.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is a plug-and-play solution that requires no additional flashing or programming from a dealership, saving you time and money.
Is this a difficult part to install myself?
Not at all. For most DIYers with basic hand tools, this is a 30-minute job. On the 2007-2008 Suburban, it’s located right next to the battery, making it very accessible.
What is a core charge?
A core charge is a deposit you pay until you return your old part. We do not require a core charge for this module, so you can keep your old part without any hassle or extra cost.
What kind of warranty is included?
This part is backed by our one-year warranty, giving you confidence in its quality and long-term reliability.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault code, meaning the TCM has detected a problem. While a faulty TCM itself can cause a P0700, this code often appears alongside other, more specific codes. Replacing a faulty TCM is a very common fix for these issues.